With a stuck valve you have no fuel going in or out of the cylinder. It can't backfire. Backfiring through the exhaust is unburnt fuel igniting in the exhaust system. Through the carby is timing. It will miss with a stuck or burnt out valve.
With a stuck valve you have no fuel going in or out of the cylinder. It can't backfire. Backfiring through the exhaust is unburnt fuel igniting in the exhaust system. Through the carby is timing. It will miss with a stuck or burnt out valve.
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